书上的启动代码,我跟着敲了一遍,最后在tomcat跑不起来~报404错。想不出哪里出错了,求指导。。tomcat 用的8.0.29,是servlet3.0+的代码很简单,(注册DispatcherServlet,启动应用上下文)。(我估计是注册DispatcherServlet不成功,但是不知道为什么?)
目录如下:
然后贴代码:
SpitterWebInitializer.java (核心)package spittr.config;import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;/**
* 扩展了AbstractAnnotationConfigDispatcherServletInitializer的类会自动配置DispatcherServlet和Spring应用上下文
* @author c00284934
*
*/
public class SpitterWebInitializer extends
AbstractAnnotationConfigDispatcherServletInitializer { /**
* 返回带有@Configuration注解的类将会用来配置ContextLoaderListener创建的应用上下文中的bean
* ContextLoaderListener加载的bean通常是驱动应用后端的中间层和数据层组件
*/
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class<?>[]{RootConfig.class};
} /**
* 带有@Configuration注解的类会用来定义为DispatcherServlet应用上下文中的bean
*/
@Override
protected Class<?>[] getServletConfigClasses() {
/**
* 当DispatcherServlet启动的时候,它会创建Spring应用上下文,并加载配置文件中所声明的bean
*/
return new Class<?>[]{WebConfig.class};//指定配置类
} @Override
protected String[] getServletMappings() {
return new String[]{"/"};//将DispatcherServlet映射到“/”
}}
WebConfig.javapackage spittr.config;import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;@Configuration
@EnableWebMvc //启用SpringMVC
@ComponentScan("spittr.web") //启用组件扫描
public class WebConfig extends WebMvcConfigurerAdapter{ public ViewResolver viewResolver(){
InternalResourceViewResolver resolver = new InternalResourceViewResolver(); //配置jsp视图解析器
resolver.setPrefix("/WEB-INF/views/");
resolver.setSuffix(".jsp");
resolver.setExposeContextBeansAsAttributes(true);
return resolver;
} @Override
public void configureDefaultServletHandling(
DefaultServletHandlerConfigurer configurer) { //配置静态资源的处理
//我们要求DispatcherServlet将对静态资源的请求转发到Servlet容器中默认的Servlet上,而不是使用DispatcherServlet本身来处理此类请求
configurer.enable();
}}RootConfig.javapackage spittr.config;import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
@Configuration
@ComponentScan(basePackages={"spittr"},excludeFilters={@Filter(type=FilterType.ANNOTATION,value=EnableWebMvc.class)})
public class RootConfig {}
HomeController.javapackage spittr.web;import static org.springframework.web.bind.annotation.RequestMethod.*;import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;@Controller
@RequestMapping("/")
public class HomeController { @RequestMapping(method = GET)
public String home(Model model) {
return "home";
}
}
home.jsp<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page session="false" %>
<html>
<head>
<title>Spitter</title>
<link rel="stylesheet"
type="text/css"
href="<c:url value="/resources/style.css" />" >
</head>
<body>
<h1>Welcome to Spitter</h1> <a href="<c:url value="/spittles" />">Spittles</a> |
<a href="<c:url value="/spitter/register" />">Register</a>
</body>
</html>
目录如下:
然后贴代码:
SpitterWebInitializer.java (核心)package spittr.config;import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;/**
* 扩展了AbstractAnnotationConfigDispatcherServletInitializer的类会自动配置DispatcherServlet和Spring应用上下文
* @author c00284934
*
*/
public class SpitterWebInitializer extends
AbstractAnnotationConfigDispatcherServletInitializer { /**
* 返回带有@Configuration注解的类将会用来配置ContextLoaderListener创建的应用上下文中的bean
* ContextLoaderListener加载的bean通常是驱动应用后端的中间层和数据层组件
*/
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class<?>[]{RootConfig.class};
} /**
* 带有@Configuration注解的类会用来定义为DispatcherServlet应用上下文中的bean
*/
@Override
protected Class<?>[] getServletConfigClasses() {
/**
* 当DispatcherServlet启动的时候,它会创建Spring应用上下文,并加载配置文件中所声明的bean
*/
return new Class<?>[]{WebConfig.class};//指定配置类
} @Override
protected String[] getServletMappings() {
return new String[]{"/"};//将DispatcherServlet映射到“/”
}}
WebConfig.javapackage spittr.config;import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;@Configuration
@EnableWebMvc //启用SpringMVC
@ComponentScan("spittr.web") //启用组件扫描
public class WebConfig extends WebMvcConfigurerAdapter{ public ViewResolver viewResolver(){
InternalResourceViewResolver resolver = new InternalResourceViewResolver(); //配置jsp视图解析器
resolver.setPrefix("/WEB-INF/views/");
resolver.setSuffix(".jsp");
resolver.setExposeContextBeansAsAttributes(true);
return resolver;
} @Override
public void configureDefaultServletHandling(
DefaultServletHandlerConfigurer configurer) { //配置静态资源的处理
//我们要求DispatcherServlet将对静态资源的请求转发到Servlet容器中默认的Servlet上,而不是使用DispatcherServlet本身来处理此类请求
configurer.enable();
}}RootConfig.javapackage spittr.config;import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
@Configuration
@ComponentScan(basePackages={"spittr"},excludeFilters={@Filter(type=FilterType.ANNOTATION,value=EnableWebMvc.class)})
public class RootConfig {}
HomeController.javapackage spittr.web;import static org.springframework.web.bind.annotation.RequestMethod.*;import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;@Controller
@RequestMapping("/")
public class HomeController { @RequestMapping(method = GET)
public String home(Model model) {
return "home";
}
}
home.jsp<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page session="false" %>
<html>
<head>
<title>Spitter</title>
<link rel="stylesheet"
type="text/css"
href="<c:url value="/resources/style.css" />" >
</head>
<body>
<h1>Welcome to Spitter</h1> <a href="<c:url value="/spittles" />">Spittles</a> |
<a href="<c:url value="/spitter/register" />">Register</a>
</body>
</html>
SpittrWebAppInitializer.javapackage spittr.config;import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;/**
* 扩展了AbstractAnnotationConfigDispatcherServletInitializer的类会自动配置DispatcherServlet和Spring应用上下文
* @author c00284934
*
*/
public class SpittrWebAppInitializer extends
AbstractAnnotationConfigDispatcherServletInitializer { /**
* 返回带有@Configuration注解的类将会用来配置ContextLoaderListener创建的应用上下文中的bean
* ContextLoaderListener加载的bean通常是驱动应用后端的中间层和数据层组件
*/
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class<?>[]{RootConfig.class};
} /**
* 带有@Configuration注解的类会用来定义为DispatcherServlet应用上下文中的bean
*/
@Override
protected Class<?>[] getServletConfigClasses() {
/**
* 当DispatcherServlet启动的时候,它会创建Spring应用上下文,并加载配置文件中所声明的bean
*/
return new Class<?>[]{WebConfig.class};//指定配置类
} @Override
protected String[] getServletMappings() {
return new String[]{"/"};//将DispatcherServlet映射到“/”
}}
WebConfig.javapackage spittr.config;import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;@Configuration
@EnableWebMvc //启用SpringMVC
@ComponentScan("spittr.web") //启用组件扫描
public class WebConfig extends WebMvcConfigurerAdapter{ public ViewResolver viewResolver(){
InternalResourceViewResolver resolver = new InternalResourceViewResolver(); //配置jsp视图解析器
resolver.setPrefix("/WEB-INF/view/");
resolver.setSuffix(".jsp");
resolver.setExposeContextBeansAsAttributes(true);
return resolver;
} @Override
public void configureDefaultServletHandling(
DefaultServletHandlerConfigurer configurer) { //配置静态资源的处理
//我们要求DispatcherServlet将对静态资源的请求转发到Servlet容器中默认的Servlet上,而不是使用DispatcherServlet本身来处理此类请求
configurer.enable();
}}
RootConfig.javapackage spittr.config;import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;@Configuration
@ComponentScan(basePackages={"spittr"},excludeFilters={@Filter(type=FilterType.ANNOTATION,value=EnableWebMvc.class)})
public class RootConfig {}
HomeController.javapackage spittr.web;import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;@Controller
public class HomeController {
@RequestMapping(value="/",method=RequestMethod.GET)
public String home(){
return "home";
}
}
2.检查你的lib目录下是不是已经添加spring相关jar包。ps:不是添加在Libraries
书的确写的不对,有几个地方:
1、@ComponentScan("spittr.web") 不是spitter.web ,你上面的代码也对了
2、HomeController映射的地址是"/" 那么浏览器访问的就是localhost:8080即可, 不需要再加spittr如果你输入localhost:8080还是404,并且你用的是IDEA,那么检查下Tomcat启动选项中有没有配置Deployment,如果没有配置也是404的。因为你的代码没有发布到tomcat。